Once your website is completed, what’s next?  

content management system or CMS is software that facilitates creating, editing, organizing, and publishing contentWordPress is a Content Management System, that allows you to create and publish your content on the web. … You don’t have to know a single line of code to publish content using WordPress.

WordPress Dashboard

Do I have to update my website?

If you want to drive traffic to your website you need fresh and relevant content.  Search Engines are always crawling web content.  To keep current you need to update your website from time to time.  Updating images and content is key.

The best way to do that is to blog/post just like you would on Facebook.  If you provide a service, write a post about your recent job, adding images and any information about the work that someone who is looking for your service may find when searching.